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Ibetx
Person to person betting on all major sports.
http://www.ibetx.com/

IG Sport
Offers exclusive live spread betting on major sporting events.
http://www.igsport.com/

Instant Action Sports
Wagering on major sports.
http://www.instantactionsports.com/

International All Sports
Features online and toll-free phone betting on major sporting events around the world.
http://www.iasbet.com/

Internet 1x2
Offers toto pool betting on soccer games around the world.
http://www.internet1x2.com/

Intertops
Offers a wide range of wagering on sport and other events.
http://www.intertops.com/

Intrade
Provides its members with the opportunity to trade futures based contracts on various sports worldwide.
http://www.intrade.com/

i-Sportsbook
Offers secure online wagering on all major sports from NFL football to baseball.
http://www.i-sportsbook.com/